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CONTENTS 



Pages 



New Echinoids from the Ripley Group of Mississippi. By 



Arthur W. Slocom i . . . 1-16 



New or Little Known Titanotheres from the Lower Uintah 



Formations. By Elmer S. Riggs 17-41 



New Trilobites from the Maquoketa Beds of Fayette 



County, Iowa. By Arthur W. Slocom 41-84 



On the Head of the Macropetalichthyids. By Erik A: son 



Stensio 85-198 



Contributions to Paleontology. By Sharat K. Roy . . . 199-220 



Occurrence of the Alligatoroid Genus Allognathosuchus in 



the Lower Oligocene. By Bryan Patterson .... 221-226 



A Silurian Worm and Associated Fauna. By Sharat K. 



Roy and Carey Croneis 227-248 



A Fossil Turtle from Peru. By Karl P. Schmidt .... 249-254 



I I 30 1 76 



in 



Natural History Survey 



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